Hi friends , like you even I love my walkman for the Sound Quality and Portability. I'm an amateur runner.

MODEL NWZ-B142f

My walkman used to work fine but suddenly one evening (two days back ) when I went for my running I switched on the walkman , the walkman started booting (dots running across LED) but this happened longer than usual and the worse was that it never went any further and walkman was shut (off).
Thing is I could have formatted it had it went into the menus

Even it is not been detected in my Laptop.

( Tried finding firmware but no use tried finding Updater without success)